It will take some time to dry out, a hairdryer would help, though.
So would liberal amounts of contact spray and contact grease.
As long as the car starts and runs there is nothing wrong with the bloody battery.
As JM had said above.
I had a similar problem in my Seat, I found a can of dry PTFE spray which when sprayed turned into some sort of a really white powder/wax type of effect that almost instantaneously removed the water from my hand, like a solvent does. I was using it in work for a totally different purpose but thought "sod it", sprayed it over all the elev connections after an FTP almost occurred on the Severn bridge and I've had no further issues since.
It also works well on sticky electric windows as it's effectively a dry lubricant. It just cleans up all the little individual connections, I've had zero issues with it since (fixing the water ingress helped as well)!!!